Four astronauts aboard a SpaceX Crew Dragon capsule splashed down early Thursday in the Pacific Ocean, ending a weeklong effort to get an unnamed crew member home to evaluate a medical issue.

A SpaceX ship recovered the spacecraft from the ocean and at around 1:30 a.m. and welcomed aboard NASA astronauts Zena Cardman and Mike Fincke, plus Kimiya Yui of the Japan Aerospace Exploration Agency and Oleg Platonov of Roscosmos, the Russian space agency.

The biggest changes happen in brain regions involved with processing sensory information and coordinating movement, according to a new study

Four astronauts are set to depart the International Space Station Wednesday amid a health concern. The unprecedented early departure will leave behind a skeleton crew.